Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e42b1cc51160ba…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 06:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 199259507d56a4a21fa320792e57ef84 SHA-1: af4bef5dadd0ead7f6683b9d4cddcc87cca5ad62 SHA-256: 91e42b1cc51160baa03d8ec842382a7f808bd1d329057b4322d83e6a37f1f080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wiskind.com/filespath/files/20210907234657.pdf In PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/72207785317.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/23443714735.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/14397015762.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/jozakenomutivimutaka.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/tewijafejixijibowobegi.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/28947369861.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/06ba5f51380e89f3b052b049f4ba59cc/zuzutisonilagelovozabe.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/femawo.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/wodewelivajegu.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/46942421699.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/danalipuwejogeroruxizako.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/236045600b844a0e55ebdbb7c24a389d/4858279475.pdfIn PDF document text
    • http://atya.eu/files/file/94165879684.pdfIn PDF document text
    • http://alptw.com/images/files/2401170792.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/33268203016.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/paridisoro.pdfIn PDF document text
    • https://clinicscrm.com/img/files/42221443817.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/23186006459.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/vijadifeb.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccd9ac0f2---16396937590.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/zigogaki.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/15571818235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=online+watch+after+we+collidedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 17844 bytes
SHA-256: 59a43f397343fdca499c6b6555e284cc86771dde7285fecc1a8edeb501b96e8c
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 10516 bytes
SHA-256: 9b309e578ab8579e64890ead309577fb29333f1b1e0817a9384b64473cdda349